Use basic parsing for IWR.

[Varbin]

Issue:
Download of Baselines fails if the Internet Explorer is not configured.

Reason:
Powershell uses parts of the Internet Explorer to parse responses of Invoke-WebRequest. For new accounts the Internet Explorer is possibly not configured.

Fix:
Add -UseBasicParsing to Invoke-WebRequest calls. As the downloaded files are either plain text or Zip archives, no parsing whatsoever is required anyway.

Validation:
Before:

[03/11/2021 18:11:21] Started...
Found exchange version: 15.0.1497.2
Can't find local baseline for 15.0.995.28
Downloading baseline file from GitHub to C:\Users\exchadmin\Desktop\CSS-Exchange
-21.03.11.1408\Security\src\Baselines\baseline_15.0.995.28.zip
LoadFromGitHub : Cannot reach out to
https://github.com/microsoft/CSS-Exchange/releases/latest, please download
baseline files for 15.0.995.28 15.0.516.30 15.0.1104.5 15.0.1473.5 15.0.1497.0
15.0.1497.2 15.0.1473.3 15.0.1497.12 15.0.620.29 15.0.1497.6 15.0.1395.4
15.0.995.32 15.0.712.23 15.0.1263.5 from
https://github.com/microsoft/CSS-Exchange/releases/latest manually to
C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security\src\Baselines,
then rerun this script from
C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security\src\Baselines.
In C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security\src\CompareEx
changeHashes.ps1:629 Zeichen:13
+             LoadFromGitHub -url $zip_file_url -filename $zip_file -in ...
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorExcep
   tion
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorExceptio
   n,LoadFromGitHub

After adding flag (there is still an error, because the zip file does not exist on Github; the connection test by downloading a text file succeeds):

PS C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security\src> .\Compare
ExchangeHashes.ps1
[03/11/2021 18:28:22] Started...
Found exchange version: 15.0.1497.2
Can't find local baseline for 15.0.995.28
Downloading baseline file from GitHub to C:\Users\exchadmin\Desktop\CSS-Exchange
-21.03.11.1408\Security\src\baseline_15.0.995.28.zip
LoadFromGitHub : C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security
\src\baseline_15.0.995.28.zip not found... please open issue on
https://github.com/microsoft/CSS-Exchange/issues, we will work on it
In C:\Users\exchadmin\Desktop\CSS-Exchange-21.03.11.1408\Security\src\CompareEx
changeHashes.ps1:629 Zeichen:13
+             LoadFromGitHub -url $zip_file_url -filename $zip_file -in ...
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorExcep
   tion
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorExceptio
   n,LoadFromGitHub